Angular Interview Questions and Answers

AngularJS is a powerful open-source JavaScript based development framework developed by Google. It is a structural framework that helps to create dynamic web application with proper maintainable architecture. It allows to use HTML as your template language and allows to extend HTML syntax to express application components. The Angular data binding and dependency reduce much of the code we currently write when use normal JavaScript. If you're an Angular developer and looking for Job change, so here is the list of the most asked Angular interview questions with answers for both beginners and experienced developer.

1. What is AngularJS?

AngularJS is an open-source JavaScript based development framework developed by Google. It is a structural framework that helps to create dynamic web application with less code and proper maintainable architecture.

2. What is Modules in AngularJS?

The AngularJS module defines an application. It is a container for the different parts of an application like application controllers. The modules defined using ng-app directive. The AngularJS module is created by using the AngularJS function angular.module like below:

var app = angular.module("testApp", []);

3. What is Controllers in AngularJS?

The AngularJS controllers control the data of AngularJS applications. The controllers are defined using ng-controller directive.

4. What is scope in AngularJS?

The scope in AngularJS is the binding part between the HTML (view) and the JavaScript (controller). The scope is an object with the available properties and methods. The scope is available for both the view and the controller. When we make a controller in AngularJS, we pass the $scope object as an argument like below:
var app = angular.module('testApp', []);
app.controller('testController', function($scope) {
$ = "phpzag";

5. What is services in AngularJS?

The services in AngularJS are functions that's used for carrying out specific tasks. The services holds some business logic and these function can be called as controllers, directive, filters and so on.

6. What is data binding in AngularJS?

The Data binding in AngularJS is the synchronization between the model and the view. The AngularJS applications usually have a data model available for the application. The HTML container where the AngularJS application data is displayed, is called the view. The view has access to the data model, and there are several ways of displaying model data in the view. We can use the ng-bind directive, which will bind the innerHTML of the element to the specified data model property. We can also use double braces {{ }} to display content from the data model.

7. What is Directives in AngularJS?

AngularJS lets us to extend HTML with new attributes called Directives. It has its own set of built-in directives which offers functionality to our applications. We can also define our own directive in our application. The AngularJS directives extended HTML attributes with the prefix ng- such as ng-app, ng-init, ng-model, ng-repeat etc.

8. What is $http in AngularJS?

The $http is a service in AngularJS that makes a Ajax POST or GET request to the server, and returns a response.

9. Explain what is injector?

Injector is an important feature of AngularJS. It is service locator that's used to get object instance of provider and invoke method with help of object instance.

10. What is Routing in AngularJS?

The Routing is a special feature of AngularJS that's handled with ngRoute module. For example if you want to navigate to different pages in your application, but you also want the application to be a single page application, with no page reloading, you can use the ngRoute module to accomplish this.

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